From: Ben Bleything <ben@...>
Date: 2009-02-03T02:57:10+09:00
Subject: Re: How to tell if one is running 32 or 64 bit Ruby on Mac OS X?

On Mon, Feb 2, 2009 at 9:45 AM, Wes Gamble <weyus@att.net> wrote:
> /usr/bin/ruby: Mach-O universal binary with 2 architectures
> /usr/bin/ruby (for architecture ppc7400):       Mach-O executable ppc
> /usr/bin/ruby (for architecture i386):  Mach-O executable i386

I can't say with 100% conviction, but i386 is a 32-bit platform, so my
guess would be that you're running a 32-bit Ruby.

Quick way to find out: download and build (but don't install!) Ruby,
taking care to enable 64-bit.  Then run your new ruby with -v and see
what it outputs.

Ben